It's no longer listed on the apps page: https://apps.splunk.com/apps/id/MySQL
I'm creating a new Splunk machine (6.3) and the older machine (6.1) had this app installed.
I am not sure what UI features the MySQL app provided, but for basic database connectivity you should consider using DBConnect
Yes, it has reached end of life and is gone. Splunk DB Connect is what you should look at now, as ssievert says.
Thanks for confirming. We've already decided to move forward with DB connect2 but was hoping I could still add mysqlconnector to our new instance to support migrated reports.
I am not sure what UI features the MySQL app provided, but for basic database connectivity you should consider using DBConnect